Vacuum cleaner



FIG. 1 is a perspective view from above and left side of a vacuum cleaner showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is an enlarged bottom view thereof; and,

FIG. 6 is a left side view thereof, the right side being a mirror image. 

The ornamental design for a vacuum cleaner, as shown and described. 